[Webkit-unassigned] [Bug 123379] New: Change WebPageProxy, WebPageCreationParameters to use ViewState

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123379

           Summary: Change WebPageProxy, WebPageCreationParameters to use
                    ViewState
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


Remove individual visibility flags from WebPageProxy, WebPageCreationParameters, and replace them with a ViewState.  This way we can pass a consistent visibility state from the UIProcess to the WebProcess.  Restructure WebPageProxy::viewStateDidChange to break the operation down into three steps:
    1) Update the m_viewState member in the WebPageProxy
    2) Send any messages to the WebPage to communicate state changes
    3) Perform any further work necessary in the UIProcess.
(In a following patch we'll merge the messages in step 2).

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